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authorVitaly Kuzmichev <vkuzmichev@mvista.com>2010-09-22 13:13:56 +0400
committerRemy Bohmer <linux@bohmer.net>2010-10-13 12:07:58 +0200
commit98fae9707fd83a61ec29d9c42c15267a735f9b71 (patch)
treec2989d7199f826676f6a711d0e150502ea2bfcd2 /common
parentac5d32d15c3f950d983740aed5403f570ac15c62 (diff)
USB-CDC: Prevent rx_req being enqueued twice
After gadget reinitializaton (after tftp has been done once) packet_received may become equal to 1 due to nuking OUT_EP while disabling it in eth_reset_config. rx_submit called from usb_eth_init queues rx_req first time. But the first call of usb_eth_recv from NetLoop queues rx_req again due to packet_received = 1. The following flow shows the path of functions calls when this happens: net/net.c:NetLoop | +-net/eth.c:eth_init | ether.c:usb_eth_init | | | +-udc_driver:usb_gadget_handle_interrupts | | udc_driver:... | | ether.c:eth_setup | | ether.c:eth_set_config | | ether.c:eth_reset_config | | udc_driver:usb_ep_disable | | udc_driver:nuke | | ether.c:rx_complete | | ether.c: packet_received = 1; | | | +-ether.c:rx_submit | udc_driver:usb_ep_queue --- The first time when rx_req is queued | +-net/eth.c:eth_rx ether.c:usb_eth_recv | +-udc_driver:usb_gadget_handle_interrupts | udc_driver:... --- no interrupts, returning +-ether.c: if (packet_received) { ... ether.c:rx_submit udc_driver:usb_ep_queue --- The second time! Signed-off-by: Vitaly Kuzmichev <vkuzmichev@mvista.com>
Diffstat (limited to 'common')
0 files changed, 0 insertions, 0 deletions